After Judas returned the money and hanged himself, the Jewish leaders bought a field with the money, in fulfillment of prophecy.

Matthew 27:3-10

3 When Judas, the one who had ◄betrayed/enabled Jesus’ enemies to seize► him, realized that they had decided to have Jesus executed, he was very sorry about what he had done. He took the 30 coins back to the chief priests and elders. 4 He said, “I have sinned. I have ◄betrayed/enabled you to seize► a man who ◄is innocent/has not done anything wrong►.” They replied, “◄That means nothing to us!/What does that mean to us?► [RHQ] That is your problem!” 5 So Judas took the money and threw it inside the Temple. Then he went away and hanged himself.

6 Later the high priests found the coins. They picked them up and said, “This is money that we paid to have a man killed [MTY], and our law does not allow such money to be put {us to put such money} into the Temple treasury.” 7 So they decided to use that money to buy the field where clay was dug for making pots {men dug ground for making pots}. They made that field a place where they buried strangers who died in Jerusalem. 8 That is why that place is still called {why they still call that place} ‘The field of blood’. 9 By buying that field, they fulfilled these words that the prophet Jeremiah wrote long ago:

They took the 30 silver coins; That was what the leaders of Israel decided that he was worth; 10 and with that money they bought the field where clay was dug for potters. They did that as the Lord had commanded me.